How does Polysomnography test works?

Polysomnography is a study of sleep cycles and behavior, usually done all night long in a sleep center, which involves observing a person at sleep while continuously charting brain waves, muscle activity, breathing, eye movements, and heart rhythms. A Polysomnography patient sleeps in a laboratory overnight. Electrodes are attached to the scalp, on the outer edge of the eyelids and to the skin on the chin. Belts are placed around the chest and abdomen. A cannula is placed in the nose to measure airflow and a probe is placed on the finger to measure the blood oxygen level. While the patient sleeps, the polysomnography records body functions such as eye movement, muscle activity, heart rate, respiration, blood oxygen levels, airflow and the electrical activity of the brain. This information is then gathered and evaluated.

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